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对传统圆形微针肋进行了优化,设计了3种不同尾角的水滴形微针肋热沉,并以去离子水为工质,实验研究了各热沉流动阻力和传热特性.结果表明:3种尾角针肋中,尾角为60°时减阻效果最好.水滴形针肋的流线型结构可以改善尾部流动分布,推迟流动由层流向过度区流的转变,且尾角越小效果越明显.不同体积流量下,水滴形针肋的最优尾角有所不同.在实验中,雷诺数范围在200～1 000内,尾角为60°的水滴形针肋热沉强化换热效果最好.当尾角为30°时,太长的尾部结构受到下一排针肋的影响,造成较大的流动阻力,导致其整体换热效果较差.
The traditional circular microgrid ribs were optimized, and three kinds of droplet-shaped microneedle heat sinks with different tail angles were designed, and the flow resistance and heat transfer characteristics of each sinker were experimentally studied with deionized water as the working fluid.Results The results showed that the drag reduction effect was the best among the three kinds of caudal needle ribs with the tail angle of 60 °.The streamlined structure of the droplet needle bar improved the tail flow distribution and postponed the transition from laminar to overdraft flow, The smaller the effect is, the smaller the optimal tail angle of droplet-shaped needles is at different volume flow rates.In the experiment, droplet-shaped pin-fin heat sinks with a Reynolds number in the range of 200-1000 and a tail angle of 60 ° When the tail angle is 30 °, the tail structure is too long by the next row of needle ribs, resulting in greater resistance to flow, resulting in poor overall heat transfer.